Global debate in recent weeks has centered on U.S. President Barack Obama's initiative to prevent the advance of the Islamic State. But another force has emerged as an unlikely rampart against the barbaric and delusional leaders of the self-proclaimed caliphate: Lebanese pluralism. Despite the shortcomings of its political system, Lebanon can provide a template for managing cultural diversity and rejecting radicalism in an unstable and fragmented setting.

In August, the Lebanese Army showed considerable fortitude as it fought Islamic State militants in the village of Arsal, near the border with Syria. Though the army has sustained heavy losses — including two soldiers that were beheaded — it has managed to compel the militants, who were operating inside a Syrian refugee camp, largely to withdraw.

It continues to fight when the need arises. International aid is now flowing toward the army, with Saudi Arabia alone pledging more than $3 billion.